Malayaite Mineral Data

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General Malayaite Information

Chemical Formula:

CaSnSiO5 = CaSnOSiO4

Composition:

Molecular Weight = 266.87 gm

Calcium 15.02 % Ca 21.01 % CaO

Silicon 10.52 % Si 22.51 % SiO₂

Tin 44.48 % Sn 50.48 % SnO

Oxygen 29.98 % O

______ ______

100.00 % 94.00 % = TOTAL OXIDE

Empirical Formula:

CaSnSiO₅

Environment:

Hydrothermal alteration of cassiterite-quartz assemblege and Sn-bearing skarns. Strucurally related to titanite.

IMA Status:

Approved IMA 1965

Locality:

Sunsei Lah, Chenderiang, Perak, Malaysia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Name Pronunciation:

Malayaite + Pronunciation

Synonym:

ICSD 81635

PDF 25-176

Malayaite Image

Images:

Malayaite

Comments: Pale bluish colored malayaite under visible and SWUV light.
Location: Red-a-Ven Mine, Meldon, Okehampton, Devon, Great Britain. Scale: 3.7 x 2 cm.
© John Veevaert

Malayaite Crystallography

Axial Ratios:

a:b:c =0.8027:1:0.7485

Cell Dimensions:

a = 7.149, b = 8.906, c = 6.667, Z = 4; beta = 113.3° V = 389.86 Den(Calc)= 4.55

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.28(1), 2.66(0.8), 5.03(0.8),

Crystal Structure:

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Higgins J B , Ribbe P H , American Mineralogist , 62 (1977) p.801-806, The structure of malayaite, CaSnOSiO4, a tin analog of titanite, Note: sample is from Red-a-Ven mine, Meldon, Devonshire, England

View Additional jPOWD Structure files for Malayaite
[1] [10] [11] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Malayaite

Color:

Colorless, Greenish gray, White, Light yellow, Orange.

Density:

4.3 - 4.55, Average = 4.42

Diaphaneity:

Translucent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Wedge shaped - Crystals shaped like a wedge.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

Fluorescent, Short UV=bright yellowish green.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Malayaite

Gladstone-Dale:

CI meas= -0.095 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.065 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1721,KPDmeas= 0.177,KC= 0.1616
Ncalc = 1.69 - 1.74

Optical Data:

Biaxial (-), a=1.764-1.767, b=1.783-1.785, g=1.798-1.802, bire=0.0340-0.0350

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

pale yellow.

Calculated Properties of Malayaite

Electron Density:

Bulk Density (Electron Density)=4.23 gm/cc
note: Specific Gravity of Malayaite =4.55 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Malayaite= 134.23 barns/electron
U=PE_Malayaite x rElectron Density= 567.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Malayaite is Not Radioactive

Malayaite Classification

Dana Class:

52.04.03.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.04)with cations in [6] and/or > [6] coordination

(52.04.03)Titanite group

52.04.03.01 Titanite CaTiSiO5 P 2₁/a 2/m

52.04.03.02 Malayaite CaSnSiO5=CaSnOSiO4 A2/a 2/m

52.04.03.03 Vanadomalayaite CaVOSiO4 C 2/c 2/m

Strunz Class:

09.AG.15 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AG -Nesosilicates with additional anions; cations in > [6] ± [6] coordination

09.AG.15 Malayaite CaSnSiO5=CaSnOSiO4 A2/a 2/m

09.AG.15 Vanadomalayaite CaVOSiO4 C 2/c 2/m

09.AG.15 Titanite CaTiSiO5 P 2₁/a 2/m

Other Malayaite Information

References:

PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Malayaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - University of Colorado - Mineral Structure Data
16 - WWW-MINCRYST

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Malayaite

CaSnSiO5 = CaSnOSiO4
Dana No: 52.04.03.02 Strunz No: 09.AG.15
Locality:

Notes: